Basic: Leo, Raph, Don, Mikey, Splinter, Shredder
B&W: Raph and Mikey (exclusive to a convention...can't remember which)
Metallic: Leo, Raph, Don, Mikey (SDCC exclusive)
Glow in the dark: Leo, Raph, Don, Mikey (amazon.com exclusive)
That's all of them for now, but also, they've already got artwork for a Pop! Foot Soldier...so I wouldn't be surprised if we get him eventually: